1 files changed, 381 insertions, 0 deletions
diff --git a/sound/firewire/motu/motu-stream.c b/sound/firewire/motu/motu-stream.c
new file mode 100644
index 000000000000..bd458029099e
--- /dev/null
+++ b/sound/firewire/motu/motu-stream.c
@@ -0,0 +1,381 @@
+/*
+ * motu-stream.c - a part of driver for MOTU FireWire series
+ *
+ * Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>
+ *
+ * Licensed under the terms of the GNU General Public License, version 2.
+ */
+
+#include "motu.h"
+
+#define	CALLBACK_TIMEOUT	200
+
+#define ISOC_COMM_CONTROL_OFFSET		0x0b00
+#define  ISOC_COMM_CONTROL_MASK			0xffff0000
+#define  CHANGE_RX_ISOC_COMM_STATE		0x80000000
+#define  RX_ISOC_COMM_IS_ACTIVATED		0x40000000
+#define  RX_ISOC_COMM_CHANNEL_MASK		0x3f000000
+#define  RX_ISOC_COMM_CHANNEL_SHIFT		24
+#define  CHANGE_TX_ISOC_COMM_STATE		0x00800000
+#define  TX_ISOC_COMM_IS_ACTIVATED		0x00400000
+#define  TX_ISOC_COMM_CHANNEL_MASK		0x003f0000
+#define  TX_ISOC_COMM_CHANNEL_SHIFT		16
+
+#define PACKET_FORMAT_OFFSET			0x0b10
+#define  TX_PACKET_EXCLUDE_DIFFERED_DATA_CHUNKS	0x00000080
+#define  RX_PACKET_EXCLUDE_DIFFERED_DATA_CHUNKS	0x00000040
+#define  TX_PACKET_TRANSMISSION_SPEED_MASK	0x0000000f
+
+static int start_both_streams(struct snd_motu *motu, unsigned int rate)
+{
+	unsigned int midi_ports = 0;
+	__be32 reg;
+	u32 data;
+	int err;
+
+	if (motu->spec->flags & SND_MOTU_SPEC_HAS_MIDI)
+		midi_ports = 1;
+
+	/* Set packet formation to our packet streaming engine. */
+	err = amdtp_motu_set_parameters(&motu->rx_stream, rate, midi_ports,
+					&motu->rx_packet_formats);
+	if (err < 0)
+		return err;
+
+	err = amdtp_motu_set_parameters(&motu->tx_stream, rate, midi_ports,
+					&motu->tx_packet_formats);
+	if (err < 0)
+		return err;
+
+	/* Get isochronous resources on the bus. */
+	err = fw_iso_resources_allocate(&motu->rx_resources,
+				amdtp_stream_get_max_payload(&motu->rx_stream),
+				fw_parent_device(motu->unit)->max_speed);
+	if (err < 0)
+		return err;
+
+	err = fw_iso_resources_allocate(&motu->tx_resources,
+				amdtp_stream_get_max_payload(&motu->tx_stream),
+				fw_parent_device(motu->unit)->max_speed);
+	if (err < 0)
+		return err;
+
+	/* Configure the unit to start isochronous communication. */
+	err = snd_motu_transaction_read(motu, ISOC_COMM_CONTROL_OFFSET, &reg,
+					sizeof(reg));
+	if (err < 0)
+		return err;
+	data = be32_to_cpu(reg) & ~ISOC_COMM_CONTROL_MASK;
+
+	data |= CHANGE_RX_ISOC_COMM_STATE | RX_ISOC_COMM_IS_ACTIVATED |
+		(motu->rx_resources.channel << RX_ISOC_COMM_CHANNEL_SHIFT) |
+		CHANGE_TX_ISOC_COMM_STATE | TX_ISOC_COMM_IS_ACTIVATED |
+		(motu->tx_resources.channel << TX_ISOC_COMM_CHANNEL_SHIFT);
+
+	reg = cpu_to_be32(data);
+	return snd_motu_transaction_write(motu, ISOC_COMM_CONTROL_OFFSET, &reg,
+					  sizeof(reg));
+}
+
+static void stop_both_streams(struct snd_motu *motu)
+{
+	__be32 reg;
+	u32 data;
+	int err;
+
+	err = motu->spec->protocol->switch_fetching_mode(motu, false);
+	if (err < 0)
+		return;
+
+	err = snd_motu_transaction_read(motu, ISOC_COMM_CONTROL_OFFSET, &reg,
+					sizeof(reg));
+	if (err < 0)
+		return;
+	data = be32_to_cpu(reg);
+
+	data &= ~(RX_ISOC_COMM_IS_ACTIVATED | TX_ISOC_COMM_IS_ACTIVATED);
+	data |= CHANGE_RX_ISOC_COMM_STATE | CHANGE_TX_ISOC_COMM_STATE;
+
+	reg = cpu_to_be32(data);
+	snd_motu_transaction_write(motu, ISOC_COMM_CONTROL_OFFSET, &reg,
+				   sizeof(reg));
+
+	fw_iso_resources_free(&motu->tx_resources);
+	fw_iso_resources_free(&motu->rx_resources);
+}
+
+static int start_isoc_ctx(struct snd_motu *motu, struct amdtp_stream *stream)
+{
+	struct fw_iso_resources *resources;
+	int err;
+
+	if (stream == &motu->rx_stream)
+		resources = &motu->rx_resources;
+	else
+		resources = &motu->tx_resources;
+
+	err = amdtp_stream_start(stream, resources->channel,
+				 fw_parent_device(motu->unit)->max_speed);
+	if (err < 0)
+		return err;
+
+	if (!amdtp_stream_wait_callback(stream, CALLBACK_TIMEOUT)) {
+		amdtp_stream_stop(stream);
+		fw_iso_resources_free(resources);
+		return -ETIMEDOUT;
+	}
+
+	return 0;
+}
+
+static void stop_isoc_ctx(struct snd_motu *motu, struct amdtp_stream *stream)
+{
+	struct fw_iso_resources *resources;
+
+	if (stream == &motu->rx_stream)
+		resources = &motu->rx_resources;
+	else
+		resources = &motu->tx_resources;
+
+	amdtp_stream_stop(stream);
+	fw_iso_resources_free(resources);
+}
+
+static int ensure_packet_formats(struct snd_motu *motu)
+{
+	__be32 reg;
+	u32 data;
+	int err;
+
+	err = snd_motu_transaction_read(motu, PACKET_FORMAT_OFFSET, &reg,
+					sizeof(reg));
+	if (err < 0)
+		return err;
+	data = be32_to_cpu(reg);
+
+	data &= ~(TX_PACKET_EXCLUDE_DIFFERED_DATA_CHUNKS |
+		  RX_PACKET_EXCLUDE_DIFFERED_DATA_CHUNKS|
+		  TX_PACKET_TRANSMISSION_SPEED_MASK);
+	if (motu->tx_packet_formats.differed_part_pcm_chunks[0] == 0)
+		data |= TX_PACKET_EXCLUDE_DIFFERED_DATA_CHUNKS;
+	if (motu->rx_packet_formats.differed_part_pcm_chunks[0] == 0)
+		data |= RX_PACKET_EXCLUDE_DIFFERED_DATA_CHUNKS;
+	data |= fw_parent_device(motu->unit)->max_speed;
+
+	reg = cpu_to_be32(data);
+	return snd_motu_transaction_write(motu, PACKET_FORMAT_OFFSET, &reg,
+					  sizeof(reg));
+}
+
+int snd_motu_stream_start_duplex(struct snd_motu *motu, unsigned int rate)
+{
+	const struct snd_motu_protocol *protocol = motu->spec->protocol;
+	unsigned int curr_rate;
+	int err = 0;
+
+	if (motu->capture_substreams == 0 && motu->playback_substreams == 0)
+		return 0;
+
+	/* Some packet queueing errors. */
+	if (amdtp_streaming_error(&motu->rx_stream) ||
+	    amdtp_streaming_error(&motu->tx_stream)) {
+		amdtp_stream_stop(&motu->rx_stream);
+		amdtp_stream_stop(&motu->tx_stream);
+		stop_both_streams(motu);
+	}
+
+	err = protocol->cache_packet_formats(motu);
+	if (err < 0)
+		return err;
+
+	/* Stop stream if rate is different. */
+	err = protocol->get_clock_rate(motu, &curr_rate);
+	if (err < 0) {
+		dev_err(&motu->unit->device,
+			"fail to get sampling rate: %d\n", err);
+		return err;
+	}
+	if (rate == 0)
+		rate = curr_rate;
+	if (rate != curr_rate) {
+		amdtp_stream_stop(&motu->rx_stream);
+		amdtp_stream_stop(&motu->tx_stream);
+		stop_both_streams(motu);
+	}
+
+	if (!amdtp_stream_running(&motu->rx_stream)) {
+		err = protocol->set_clock_rate(motu, rate);
+		if (err < 0) {
+			dev_err(&motu->unit->device,
+				"fail to set sampling rate: %d\n", err);
+			return err;
+		}
+
+		err = ensure_packet_formats(motu);
+		if (err < 0)
+			return err;
+
+		err = start_both_streams(motu, rate);
+		if (err < 0) {
+			dev_err(&motu->unit->device,
+				"fail to start isochronous comm: %d\n", err);
+			stop_both_streams(motu);
+			return err;
+		}
+
+		err = start_isoc_ctx(motu, &motu->rx_stream);
+		if (err < 0) {
+			dev_err(&motu->unit->device,
+				"fail to start IT context: %d\n", err);
+			stop_both_streams(motu);
+			return err;
+		}
+
+		err = protocol->switch_fetching_mode(motu, true);
+		if (err < 0) {
+			dev_err(&motu->unit->device,
+				"fail to enable frame fetching: %d\n", err);
+			stop_both_streams(motu);
+			return err;
+		}
+	}
+
+	if (!amdtp_stream_running(&motu->tx_stream) &&
+	    motu->capture_substreams > 0) {
+		err = start_isoc_ctx(motu, &motu->tx_stream);
+		if (err < 0) {
+			dev_err(&motu->unit->device,
+				"fail to start IR context: %d", err);
+			amdtp_stream_stop(&motu->rx_stream);
+			stop_both_streams(motu);
+			return err;
+		}
+	}
+
+	return 0;
+}
+
+void snd_motu_stream_stop_duplex(struct snd_motu *motu)
+{
+	if (motu->capture_substreams == 0) {
+		if (amdtp_stream_running(&motu->tx_stream))
+			stop_isoc_ctx(motu, &motu->tx_stream);
+
+		if (motu->playback_substreams == 0) {
+			if (amdtp_stream_running(&motu->rx_stream))
+				stop_isoc_ctx(motu, &motu->rx_stream);
+			stop_both_streams(motu);
+		}
+	}
+}
+
+static int init_stream(struct snd_motu *motu, enum amdtp_stream_direction dir)
+{
+	int err;
+	struct amdtp_stream *stream;
+	struct fw_iso_resources *resources;
+
+	if (dir == AMDTP_IN_STREAM) {
+		stream = &motu->tx_stream;
+		resources = &motu->tx_resources;
+	} else {
+		stream = &motu->rx_stream;
+		resources = &motu->rx_resources;
+	}
+
+	err = fw_iso_resources_init(resources, motu->unit);
+	if (err < 0)
+		return err;
+
+	err = amdtp_motu_init(stream, motu->unit, dir, motu->spec->protocol);
+	if (err < 0) {
+		amdtp_stream_destroy(stream);
+		fw_iso_resources_destroy(resources);
+	}
+
+	return err;
+}
+
+static void destroy_stream(struct snd_motu *motu,
+			   enum amdtp_stream_direction dir)
+{
+	struct amdtp_stream *stream;
+	struct fw_iso_resources *resources;
+
+	if (dir == AMDTP_IN_STREAM) {
+		stream = &motu->tx_stream;
+		resources = &motu->tx_resources;
+	} else {
+		stream = &motu->rx_stream;
+		resources = &motu->rx_resources;
+	}
+
+	amdtp_stream_destroy(stream);
+	fw_iso_resources_free(resources);
+}
+
+int snd_motu_stream_init_duplex(struct snd_motu *motu)
+{
+	int err;
+
+	err = init_stream(motu, AMDTP_IN_STREAM);
+	if (err < 0)
+		return err;
+
+	err = init_stream(motu, AMDTP_OUT_STREAM);
+	if (err < 0)
+		destroy_stream(motu, AMDTP_IN_STREAM);
+
+	return err;
+}
+
+/*
+ * This function should be called before starting streams or after stopping
+ * streams.
+ */
+void snd_motu_stream_destroy_duplex(struct snd_motu *motu)
+{
+	destroy_stream(motu, AMDTP_IN_STREAM);
+	destroy_stream(motu, AMDTP_OUT_STREAM);
+
+	motu->playback_substreams = 0;
+	motu->capture_substreams = 0;
+}
+
+static void motu_lock_changed(struct snd_motu *motu)
+{
+	motu->dev_lock_changed = true;
+	wake_up(&motu->hwdep_wait);
+}
+
+int snd_motu_stream_lock_try(struct snd_motu *motu)
+{
+	int err;
+
+	spin_lock_irq(&motu->lock);
+
+	if (motu->dev_lock_count < 0) {
+		err = -EBUSY;
+		goto out;
+	}
+
+	if (motu->dev_lock_count++ == 0)
+		motu_lock_changed(motu);
+	err = 0;
+out:
+	spin_unlock_irq(&motu->lock);
+	return err;
+}
+
+void snd_motu_stream_lock_release(struct snd_motu *motu)
+{
+	spin_lock_irq(&motu->lock);
+
+	if (WARN_ON(motu->dev_lock_count <= 0))
+		goto out;
+
+	if (--motu->dev_lock_count == 0)
+		motu_lock_changed(motu);
+out:
+	spin_unlock_irq(&motu->lock);
+}